http://www.explainthatstuff.com/hydraulics.html
https://www.youtube.com/watch?v=wHMHxO9Ys_0
http://www.grc.nasa.gov/WWW/k-12/WindTunnel/Activities/Pascals_principle.html
http://www.hydraulicmania.com/hydraulic_cylinders.htm
http://www.scienceguy.org/Articles/SyringeHydraulics.aspx
http://science.howstuffworks.com/transport/engines-equipment/hydraulic.htm
https://www.youtube.com/watch?v=wTM6Zik_tww
The entire details for Hydro can be downloaded here